@Jon Kelley Can you confirm an MPN ID is associated with the application by sharing the screenshot of the portion below the Publisher domain? It is not enough if we verify the domain alone. You will need to link the MPN ID with the application as described in the example below where I have set a publisher domain but have not set the MPNM ID and hence the process is not complete.
Refer the steps in the article for steps on this process - https://learn.microsoft.com/en-us/azure/active-directory/develop/mark-app-as-publisher-verified